STIs affect men and women of all
backgrounds and economic levels. But nearly half of all STIs in the U.S. happen in
people younger than age 25.
STIs are on the rise. This may be
because more sexually active people have multiple sex partners during their life.
Many STIs cause no symptoms at
first. Also, many STI symptoms may look like those of other diseases not transmitted
through sexual contact. This is especially true in women. STIs without symptoms can
still be spread to other people.
Women suffer more severe symptoms
Some STIs can spread into the
womb (uterus) and fallopian tubes and cause PID. This can lead to both infertility
and tubal pregnancy.
STIs in women, especially HPV
infection, also may lead to cervical and anal cancer. Men can also get penile and
anal cancer from HPV infection.
STIs can be passed from a
mother to her baby before or during birth. Some infections of the newborn may be
successfully treated. Others may cause a baby to be permanently disabled or even
Many STIs can be successfully
treated when diagnosed early.